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2 Sheets-Sheet l. G. BOLTON.

BOILBR m0 Model.)

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2 Sheets- Sheet 2. G. BOLTON.

BUILER (No Model.)

Affarney,

l Fnted Aug. 23, 1887.

[HHH IM Unrrnnr STATES` PATENT Ormes.

GEORGE BOLTON, OF PETERBOROUGH, ONTARIO, CANADA.

BOILER.

SPECIFICATION forming part of Letters Paten-t No.368,645,dated August23, 1887.

Application filed October 15, 1886. Serial No. 216,339. (No model.)Patented in Canada April 20, 1885, No. 21,463.

To @ZZ 107mm it may concern:

Be it known that I, GEORGE BOLTON, a subject ofthe Queen of GreatBritain, residing at Peterborough, in the Province of Ontario, Canada,have invented certain new and useful Improvements in Boilers, of whichthe following is a specification, reference being had therein to theaccompanying drawings.

This invention has relation to boilers to be used in heating buildingsby means of steam or hot water distributed throughout the same by asystem of piping communicating with the boiler; and among the objects ofthe invention are to reduce the cost of manufacture, the number ofdifferently/'shaped parts, the diffieulty of keeping the boiler cleanand in order and of repairing certain parts thereof, and to increase thefacility of operating the boiler, its capacity for heating water passingtl1erethrough, and its capability of forcing the circulation of thewater therethrough.

Other objects and advantages of the inven' tion will appear in lthefollowing description, and the novel features thereof will beparticularly pointed out in the claims.

Referring to the drawings, Figure 1 is a front elevation, and Fig. 2 anend elevation, of a boiler embodying the novel features of my invention.Fig. 3 is a horizontal section above the gratos, and Fig. 4 a centralvertical section of the boiler proper. Figs. 5 and 6 are perspectives ofdouble couplings employed.

Like letters indicate like parts in allthe fgures of the drawings.

The boiler proper, whether single or double,

. Figs. 1 and 2, an inclosing-jacket, having any suitableV uptake, A',Fig. 2, for the products of combustion.

As before indicated, the boiler is constructed so that by changing thecap and base it may be enlarged from a boiler having a single firepotand grate to a boiler having two or any other desired number offire-pots and grates. There is secured within the ash-pit suitablecleats, B, for thesupport of any ordinary gratebars.

The base of the boiler consists of a single hollow casting, E, which issubstantially rectangular in crossisection, having a similar interiorconformation, except that the walls ot' the base are inclined, as at E',to forni a firepot with slanting walls, which act to concentrate thefuel upon the grate below. 5

In the single boiler the base is onelhalf the length of that shown inFig. l, so that when used in connection with the circulating-pipeshereinafter described, and with a cap ot' like dimensions, a completeapparatus is produced, 6o and onewhich, by the substitution of bases andcaps of increased dimensions and of duplicate sets of circulating-pipesand couplings, is readily increased to meet the demands of heatingbuildings of varied sizes. In other words, using a cap and a baseextending from the left of Fig. l to the dotted line X, a double boileris converted into a-single one. The base is provided at its top with aseries of openings, E, into which are screw-threaded 7o verticalcirculating-pipes F, extending coinpletely around the same, except atthe front, where a single T- pipe, G, is screw-threaded into an openingformedin` the base. At each end ofthe T there is a quarter-turncoupling, H, which is connected with vertical pipes I. All of thevertical pipes F,which are arranged at the back of the base, areprovided with double T- couplings, J, with which horizontal pipes Kcommunicate. The front end of the' 8O pipes K communicate with a T-coupling, L, which is also a quarter-turn coupling#that is to say, theend of the branch of the T is curved, as at L', (see Fig. 5,) to form aquarterturn. A series of horizontal pipes, K, and T and turn couplings Lare arranged above the fire-box and also above the single T- couplingand quarter-bends G and H, respectively, so as to forni a fuel-supply orstoke hole, M, (see Fig. 4,) for each boiler. Above the horizontal 9opipes and in line therewith are a series of depending pipes, N, securedwithin apertures formed in the cap O of the boiler. Each of thedepending pipes is closed by a conical plug, N', as shown.

The cap O consists of a single casting having in its lower surface aseries of screw-threaded apertures for all the vertical pi pes of theboiler,

vand said cap is hollow, like the base, and it may be provided withstrengtheningposts, loo ribs, or spacing-blocks, as shown at Y, Fig. 4.Screwplugs or other well-known devices, as shown at P, may be providedto close coreholes or to give access to the interior of the cap or basefor purposes of cleaning or repair. A supply and delivery pipe may beprovided yat the base and cap, as indicated by the dotted lines V andIV, respectively.

This being the construction, the operation is as follows: The pipes Vand W being connected with any well-known system of piping for heating abuilding, the water 'employed fills all the hollow parts of the boiler,and, entering at the base, is first subjected to the heat of the fuel inthe fire-pot as the water circulates or passes thereabout. The waterinthe horizontal pipes K is then subjected to the heat of the productsof combustion and at the hottest portion thereof, and there being twohorizontal pipes to each one of the rear vertical pipes there is doublethe capacity of said vertical pipes in the horizontal, so that doublethe quantity of water is subjected to the more intense heat, andtherefore a circulation is forced upwardly through the front verticalpipes, F, which communicate with the T and turn L. The water in the capfills the depending pointed pipes N, where said water is subjected tothe heat of the products of combustion as they pass upwardly above lthehorizontal pipes K. These latter pipes act as bafiie-plates to retainand give a circuitous route to the products of combustion, so that theynaturally cling to or circulate around between the said vertical pipes.If desired, separate bathe-plates may be arranged in the seriesofvertic'al pipes or upon the cap to further retard or direct theproducts of combustion.

Certain novel features herein shown and not claimed are shown andclaimed in another pending application.

Having described my invention and its operation, what I claim is- 1. Ina boiler of the class described, a hollow base formed as a singlecasting, a hollow 'cap formed as a single casting, a series of verlingscommunicating with vertical pipes connected with the cap, substantiallyas specified.

2. In al boiler of the class described, a hollow cap and a hollow baseconnected by vertical tubes extending on three sides thereof, aT-coupling mounted upon the base at a fourth side thereof and connectedby quarter-turns with vertical pipes communicating with the cap, and aseries of horizontal pipes arranged above the fire-pot and communicatingwith the cap and base by means of double T and T and turn couplings,substantially as specified.

3. In a boiler of the class described, Bthe combination of a hollow cap,a hollow base, vertical pipes connecting the same, a'T projecting fromthe base at one side thereof and communicating by quarter-turns withvertical pipes connected with the cap, thereby forming a Stoke-hole, anre-pot opening in the base, and a rocking grate arranged below thebase, together with a series of horizontal pipes arranged above thefire-pot and communicating with the vertical pipes of the boiler,substan tially as specified.

4. v In a boiler of the class described, a T and turn coupling, incombination with a vertical and horizontal pipes connected to the capand base, as shown, substantially as specified.

5. In a boiler of the class described, the combination of verticalpipes, a double T- coupling communicating therewith, horizontal pipesconnected with the double T and with a T and turn coupling, and aVertical pipe eX- tending from the latter, substantially as specifled.

6. rIhe combination, with the base E, having the inclined walls E, ofthe coupling G, the vertical pipes I, the quarter-turns H, the pipes F,the double Ts J, the T and turns L, the depending pipes N, and the capO, substantially as specified.

In testimony whereof I affix my signature in presence of two witnesses.

GEO. BOLTON.

Witnesses: v

W. II. MOORE, W. KELsEY HALL.

